Science physics
posted by Sarah on .
mandy drops a 2.0kg book from a height of 4.5m. how much work has gravity done on the book?
M=2.0kg
D= 4.5m
Not actually sure what to do next. Because none of the formulas work. I need work but I don't even know the force. To find force I need mass which I have but I don't have acceleration.

The acceleration is due to gravity
g = 9.8 m/s^2 
The question is asking for work though. And the answer says it's 88J but I don't get how they got that as the answer

work is in Joules
2.0kg * 9.8 m/s^2 * 4.5m = 88.2 kgm/s^2 = 88.2Nm = 88.2J
work = force * distance
force = mass * acceleration 
Ohhh. That's what I missed. Okay thanks for explaining step by step. It helped a lot

Ohhh. That's what I missed. Okay thanks for explaining step by step. It helped a lot

Ohhh. That's what I missed. Okay thanks for explaining step by step. It helped a lot